William Kinsella

I am searching for William Kinsella Dublin Ireland and Mary Ann Harty who were sponsors on my great grandfathers christening certificate Thomas Doolin christened 3rd October 1900. Thomas's parents were James Doolin and Anne Madden so they may have been relatives or else very good friends. Can anyone help as I would like to establish a connection or else another lead to follow? Thanks in advance, Zandra.